Tech

Get APRS status via SMS/email

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I wrote an email system that will email you a APRS station’s info (last heard time, position, and APRS status).

To use the system, just send an email or SMS (text message) to aprs@tomh.us with the station’s callsign at the start of the message. Emails must be in plain text format, not multipart/HTML.

You should receive a response in about a minute. It will look something like this:

WA7RVV-12 6min ago:
Saltese, Mt 59867, USA
/W2,MTN,LOOKOUT PASS
47.454167,-115.658333

I made you a 1234567890 countdown timer

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Unix time will reach 1234567890 on 2009-02-13 15:31:30. I made a countdown timer in bash.

#!/bin/sh
printf "tUNIX TIMEt TO GO:tDAYStHOURStMINUTEStSECONDSn"
while true;
	DATE=`date +%s`
	SECONDS=$[1234567890-$DATE]
	MINUTES=$[$SECONDS/60]
	HOURS=$[$MINUTES/60]
	DAYS=$[$HOURS/24]
	printf "t%stt%4st%5st%7st%7sr" "$DATE"	"$DAYS" "$[$HOURS%$DAYS]" "$[$MINUTES%$HOURS]" "$[$SECONDS%$MINUTES]"
	sleep 1
done

Send a file to a process by writing to /proc

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I’d like a way to “write” to a Linux filesystem, but rather than write the file, have the file sent to a process (so that it can be sent to another server over the network). I think this is possible with a kernel module by writing to /proc/mykernelmodule/filetosend, but I don’t know of any good resources that teach this. Any ideas?

Edit: This seems like a pretty good resource (haven’t started hacking on it yet): http://tldp.org/LDP/lkmpg/2.6/html/x810.html.